FREMGANGSMAADE, REFERENCEVAESKE OG REFERENCEVAESKESYSTEM TIL SAMTIDIG KALIBRERING OG/ELLER KVALITETSKONTROL AF CALCIUMFOELSOMME ELEKTRODER OG PH-ELEKTRODER

摘要

A reference liquid for calibration or quality control of instruments which determine ionized calcium and pH. The reference liquid contains both a particular calcium ion activity and a pH-buffer and can therefore be used for calibration of both the calcium-sensitive electrode and the pH-electrode in the instruments. The pH-buffer is a nitrogen-containing organic sulphonic acid and the salt of this acid, the acid having a pK in the range of 6.6-7.6. The reference liquid has an ionic strength of 0.15-0.17, a buffer capacity beta in the range of 0.04-0.10 and is packed in glass ampoules.